Java平台的JSON处理的API的演示

JSON是一种轻量级数据交换格式,rails4的 respond_to do |format|拿掉xml以json取代,2013 了，再拿xml当default API就不是有一点的out了
JSR-353的参考实现JSON-P将作为即将发布的JavaEE 7的一部分

以下代码演示JSONP的读写API

 import java.io.*;

 import javax.json.*;
 import javax.json.stream.*;
 import javax.json.stream.JsonParser.*;

 public class JsonDemo {
     private String address = "./json_demo.js";

     public static void main(String[] args) throws Exception {
         JsonDemo demo = new JsonDemo();
         demo.write();
         demo.read();
     }

     public void write() throws Exception{
         JsonBuilderFactory factory = Json.createBuilderFactory(null);
         JsonArray jsonArray = factory.createArrayBuilder()
             .add(factory.createObjectBuilder()
                 .add("username", "zhijia,.zhang")
                 .add("email", "jiahut@gmail.com"))
             .add(factory.createObjectBuilder()
                 .add("username", "lishi")
                 .add("email", "lishi@demo.com"))
             .build();
         try (JsonWriter jsonWriter = Json.createWriter(new FileWriter(address))) {
               jsonWriter.writeArray(jsonArray);
         }
     }

     public void read() throws Exception{
         JsonParserFactory factory = Json.createParserFactory(null);
         StringBuffer stb = new StringBuffer();
         String str = null;

         try(BufferedReader rd = new BufferedReader(new FileReader(address))){
             while((str = rd.readLine()) != null){
                 stb.append(str);
             }
         }

         JsonParser parser = factory.createParser(new StringReader(stb.toString()));
         while (parser.hasNext()) {
           Event event = parser.next();
           switch (event) {
             case KEY_NAME: {
               System.out.print(parser.getString() + "="); break;
             }
             case VALUE_STRING: {
               System.out.println(parser.getString()); break;
             }
           } // end switch
         }// end while
     }
 }

命令行下编译与运行
- 请先下载jsonp的jar到当前目录
- 请使用java7或以上版本
- 编译 javac -cp .;javax.json-1.0-fab.jar JsonDemo.java
- 运行 java -cp .;javax.json-1.0-fab.jar JsonDemo
- 当然你也可以打开产生的json_demo.js 文件看看生成的内容

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Jsonp Api Demo in Java

Java平台的JSON处理的API的演示